Reliability and Validity of the Turkish Short-Form McGill Pain Questionnaire-2 (TR-SF-MPQ-2) in patients with chronic low back pain

OBJECTIVES: The aim of this study was to assess validity and reliability of the Turkish version of the expanded and revised version of the Short-Form McGill Pain Questionnaire (TR-SF-MPQ-2) in patients with chronic low back pain (CLBP) and to investigate the relationship between TR-SF-MPQ-2 and etiology, pain scales, and disability index. PATIENTS AND METHODS: Between October 2014 and December 2014, a total of 194 patients with CLBP (66 males, 128 females; mean age 50±14.3 years; range, 35 to 65 years) attending to our outpatient clinic were included. To assess reliability, Cronbach alpha (α) and intraclass correlation coefficient (ICC) were estimated for participants who completed the questionnaire in the morning and afternoon. The validity of the questionnaire was evaluated by analyzing the confirmatory factor analysis. The Visual Analog Scale and Oswestry Disability Index were also used to test concurrent validity of the questionnaire. RESULTS: For total score, Cronbach α was 0.912 and ICC was 0.973, ranging from 0.72 to 0.84 for Cronbach α and from 0.960 to 0.989 for ICC in subgroups. The confirmatory factor analysis showed a good model fit for each subgroup (χ2/Df <3, GFI >0.95, CFI >0.90, NFI >0.90, and RMSEA <0.10). The correlation coefficient between the mean VAS and the mean total score was 0.648. CONCLUSION: Our study results indicate that the Turkish version of the SF-MPQ-2 is a reliable and valid tool to assess pain in the Turkish patients with CLBP.